topic Re: Re: Re: Flexbus Clockout in Kinetis Microcontrollers

Flexbus Clockout

VGS — Thu, 11 Sep 2014 07:09:45 GMT

Iam using TWR-K70 board for interfacing LCD with SSD 1963 controller using Flex bus.

I am trying to measure Flex-bus clock (PTC3 - ALT 5 ) from the TWR module.But it is always showing 20 MHz

even when i change the flex bus frequency using SIM-CLKDIV1 Register.

I tried variying the clock from 40 MHz to 10 MHz but i am getting the same output (20 MHz).

Can any one help me with how to measure the Flex bus Clock

Re: Flexbus Clockout

Kan_Li — Thu, 11 Sep 2014 07:20:43 GMT

Hi ,

Would you please share your project or code for a review? I will try to reproduce it based on my TWR-K70.

Thanks for your patience!

Have a great day,
Kan

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Re: Re: Flexbus Clockout

VGS — Thu, 11 Sep 2014 07:59:40 GMT

hi Kan

Thanks .

What is the maximum speed for flex bus in k70-120MHz .

i am attaching flexbus configuration file

Please review it.

If required i can also send my project file.

i am testing with D4D sample code for TWR LCD (320*240).

Re: Re: Re: Flexbus Clockout

Kan_Li — Fri, 12 Sep 2014 08:39:21 GMT

Hi ,

I have implemented a PE demo based on TWR-K70, I just enabled the port c clock gate and set PTC3 as clockout, and changed the flexbus clkout as below:

60MHz

40Mhz

seems no problem to output clock other than 20MHz, maybe it is a software issue, so I attached my project for your reference, please kindly refer to it for more details.

Hope that helps,

Have a great day,
Kan